Robert Howells wrote:

You should be able to remove a piece of Ram at a time to check whether one piece is faulty ! ?

It does sound rammy.

However, if you are game AND you have the iMac that is easy to open, a few screws has the back off and a quick look will tell you if the capacitors are bloated, they should look cylindrical with a flat clean and shiny top surface. So far I have not seen bloating in the caps that have a 'K' cut in the top as opposed to an "X".

http://en.wikipedia.org/wiki/Capacitor_plague

Not sure if Apple is still happily repairing these iMacs with bloated caps.

Good luck
Paul

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